For future usage mainly, since Maexxna's deathrattle was to crash the US/EU servers. Anyway seems pretty neat, most interesting thing so far is that the bosses respond to each of your emotes differently (Maexxna has several different hisses, other two both just say one thing in response to emotes and another in response to you either taking a while or board clearing), but if you just bumrush through the normal mode matches you can totally miss all of them except the greeting/death emote. The AI is still dumb but not as consistently dumb and evidently the heroic advantages outweigh the dumbness. The sound for clicking on the eggs is incredible.
Meanwhile: Hearthstone has 108,000 viewers on twitch, a mere 3000 less than League of Legends (obviously whenever the servers come back that'll go down slightly).
Edit: Apparently the tutorial has changed a bit in the past 10 months or whatever it is since the final beta reset, might be worth checking it out on the Asia server.